1993 Volume 62 Issue 11 Pages 3825-3828
Magnetization curves [MC] and temperature dependence of the AC susceptibility [TS] were measured in the superconducting phase of CeRu2 with Tc=6.55 K in zero field. For fields higher than 0.8 T in [TS], the superconducting susceptibility behaves normally up to the lowest transition temperature TcL where it decreases suddenly; the field-induced reentrant superconductivity occurs at TcL and breaks very sharply to the normal state at TcH (the highest transition temperature). In [MC], an anomaly appears when the magnetization reaches to the extrapolated magnetization of the normal state at HR (reentrant field). Magnetization drops suddenly to negative in the field-increasing process for temperatures below 3.9 K, and it only increases for temperatures above 4.0 K. Reentrant superconductivity occurs between, HR and Hc2. The reentrant phase has positive magnetization in the background.
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